class Solution {
public:
    int maxTurbulenceSize(vector<int>& arr)
    {
        int ret = 1, n = arr.size();
        vector<int> f(n, 1), g(n, 1);
        for (int i = 1; i < n; i++)
        {
            if (arr[i] > arr[i - 1])f[i] = g[i - 1] + 1;
            if (arr[i] < arr[i - 1])g[i] = f[i - 1] + 1;
            ret = max(ret, max(f[i], g[i]));
        }

        return ret;


    }
};